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The aim of this study was to measure the β-agonist, clenbuterol in bovine feeds and meat in North and South of Mexico. Clenbuterol is used illegally as growth promoter in animal feeding in farms animals due to muscle hypertrophy and lipolisis effect. In Mexico, there is a suspected in their unlicensed use in certain commercial feedlots. Total 16 food samples and 90 samples of meat were analyzed by 2 commercially clenbuterol enzyme immunoassays kits. The samples were collected during 2006. Approximately, 75% of the animal feed samples and 16.6 % of meat analyzed were found positives in levels ranged 2525-53787 ppt and 0.1-2.3 µg kg-1. These information indicate that the abuse of clenbuterol during the last 5 years is not declining in some farms of Mexico with a health human risk.
